Preparation for visible-light responsible BiVO4 catalyst

Abstract

The invention discloses a preparation method for a visible-light responsible BiVO4 catalyst. The method comprises: taking a bismuth compound and a vanadium compound respectively as a bismuth source and a vanadium source, taking mixtures of water and an organic alcohol with different ratios as reaction solvents, and performing a hydro-thermal synthesis reaction, so as to obtain a catalytic material in the forms of a nanometer small particle, a nanometer ellipsoid, a flower-shaped structure or a branch structure. The visible-light responsible catalyst containing BiVO4 with different morphologies helps to greatly improve the photocatalysis degradation efficiency when being applied to the field of photocatalytic degradation of pollutants. The preparation method has the advantages of simple operation, mild reaction conditions, low equipment cost, relatively strong visible-light absorption, good visible-light catalytic performance and the like.

Description

technical field [0001] The present invention relates to visible light-responsive BiVO 4 The field of nanomaterial preparation and photocatalysis technology, specifically related to the preparation of nanoparticles, nano-ellipsoids, flower-like structures and dendritic structures BiVO by hydrothermal synthesis 4 materials, and the visible light response of BiVO with different morphologies 4 As a photocatalyst, degrades Rhodamine B. Background technique [0002] With the increasing global environmental pollution and energy crisis, the preparation, development and application of visible light-responsive catalytic technology and its materials that can make full use of green and environmentally friendly solar energy to realize photocatalytic degradation of pollutants or hydrogen production have become a major issue in chemistry and materials science. and environmental science and other hot research topics. Since Fujishima discovered TiO in 1972 2 Since the catalytic decomposi...

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Problems solved by technology

However, TiO 2 However, the photocatalytic activity has not reached the effect of practical application. There are two main problems: one is that TiO 2 The band gap is wide (3.0-3.2eV), and the spectral response range is narrow. It can only absorb photons with a wavelength less than 387nm, and can only absorb ultraviolet light accounting for 3-4% of the total energy of sunlight. Catalytic reaction; another key reason photoinduced electron-hole pair generation is less and recombination reaction is more likely

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